<template>
    <div>
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/welcome' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
        <el-card>
            <el-alert title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false" show-icon></el-alert>
            <el-row class="catopt">
                <el-col>
                    <span>选择商品分类：</span>
                    <el-cascader :options="catelist" :props="cateProps" @change="handleChange" v-model="selectedCateKeys" expand-trigger="hover"></el-cascader>
                </el-col>
            </el-row>
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <el-tab-pane label="动态参数" name="many" >
                    <el-button type="primary" :disabled="isBtnDisabled" size="mini" @click="addDialogVisible = true">添加参数</el-button>
                    <el-table :data="manyTableData" stripe>
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"></el-input>
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <el-tab-pane label="静态属性" name="only">
                    <el-button type="primary" :disabled="isBtnDisabled" size="mini" @click="addDialogVisible = true">添加属性</el-button>
                    <el-table :data="onlyTableData" stripe>
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"></el-input>
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>
        <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" >
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>
        <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px" >
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data () {
        return {
            catelist: [],
            cateProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children'
            },
            selectedCateKeys: [],
            activeName: 'many',
            manyTableData: [],
            onlyTableData: [],
            addDialogVisible: false,
            addForm: {
                attr_name: ''
            },
            addFormRules: {
                attr_name: [{
                required: true, message: '请输入参数名称', trigger: 'blur'
                }]
            },
            editDialogVisible: false,
            editForm: {},
            editFormRules: {
                attr_name: [{
                required: true, message: '请输入参数名称', trigger: 'blur'
                }]
            }
        }
    },
    created () {
        this.getCateList()
    },
    computed: {
        isBtnDisabled () {
            if (this.selectedCateKeys.length !== 3) return true
            return false
        },
        cateId () {
            if (this.selectedCateKeys.length === 3) return this.selectedCateKeys[2]
            return null
        },
        titleText () {
            if (this.activeName === 'many') return '动态参数'
            return '静态属性'
        }
    },
    methods: {
        async getCateList () {
            const { data: res } = await this.$http.get('categories')
            if (res.meta.status !== 200) return this.$message.error('获取商品分类失败')
            this.catelist = res.data
        },
        handleChange () {
           this.getParamsData()
        },
        handleTabClick () {
            this.getParamsData()
        },
        async getParamsData () {
            if (this.selectedCateKeys.length !== 3) {
                this.selectedCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return this.selectedCateKeys
            }
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
                params: { sel: this.activeName }
            })
            if (res.meta.status !== 200) return this.$message.error('参数列表获取失败！')
            res.data.forEach(item => {
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                item.inputVisible = false
                item.inputValue = ''
            })
            if (this.activeName === 'many') this.manyTableData = res.data
            else this.onlyTableData = res.data
        },
        addDialogClosed () {
            this.$refs.addFormRef.resetFields()
        },
        addParams () {
            this.$refs.addFormRef.validate(async valid => {
                const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
                    attr_name: this.addForm.attr_name,
                    attr_sel: this.activeName
                })
                if (res.meta.status !== 201) return this.$message.error('添加参数失败！')
                this.$message.success('添加参数成功！')
                this.addDialogVisible = false
                this.getParamsData()
            })
        },
        async showEditDialog (id) {
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${id}`, {
                params: { attr_sel: this.activeName }
            })
            if (res.meta.status !== 200) return this.$message.error('获取信息失败！')
            this.editForm = res.data
            this.editDialogVisible = true
        },
        editDialogClosed () {
            this.$refs.editFormRef.resetFields()
        },
        editParams () {
            this.$refs.editFormRef.validate(async valid => {
                const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
                    attr_name: this.editForm.attr_name,
                    attr_sel: this.activeName
                })
                if (res.meta.status !== 200) return this.$message.error('参数修改失败！')
                this.$message.success('参数修改成功！')
                this.getParamsData()
                this.editDialogVisible = false
            })
        },
        async removeParams (id) {
            const confirmResult = await this.$confirm('是否删除该参数?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err => err)
            if (confirmResult !== 'confirm') return this.$message.info('取消了删除操作！')
            const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${id}`)
            if (res.meta.status !== 200) return this.$message.error('删除失败！')
            this.$message.success('删除成功！')
            this.getParamsData()
        },
        async handleInputConfirm (row) {
            if (row.inputValue.trim().length === 0) {
                row.inputValue = ''
                row.inputVisible = false
                return row
            }
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            this.saveAttrVals(row)
        },
        showInput (row) {
            row.inputVisible = true
            // $nextTick 页面被重新渲染之后才会调用代码
            this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus()
            })
        },
        async saveAttrVals (row) {
            const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
                attr_name: row.attr_name,
                attr_sel: row.attr_sel,
                attr_vals: row.attr_vals.join(' ')
            })
            if (res.meta.status !== 200) return this.$message.error('参数修改失败！')
            this.$message.success('参数修改成功！')
        },
        handleClose (i, row) {
            row.attr_vals.splice(i, 1)
            this.saveAttrVals(row)
        }
    }
}
</script>

<style lang="less" scoped>
    .catopt {
        margin: 15px 0;
    }

    .el-tag {
        margin-right: 10px;
    }

    .input-new-tag {
        width: 150px;
    }
</style>
